G - Physics – 10 – L
Patent
G - Physics
10
L
G10L 19/12 (2006.01) G10L 19/00 (2006.01)
Patent
CA 2166138
A speech signal encoder includes a speech analyzer for determining short-term prediction codes at a predetermined time interval. The prediction codes indicate frequency characteristics of a speech signal. A reverse filter is provided for calculating residual signals of first synthesis filter. The residual signals is defined by the short-term prediction codes. A residual code book stores past residual signals. Further, a plurality of delay codes, each of which represents pitch correlation of the speech signal, are tried a predetermined number. A vector generator issues, using the residual code book, delay residual vectors each of which corresponds to the delay code. A filter is provided for generating a synthesis signal using second synthesis filter which receives the delay residual vectors and which is defined by the short-term prediction codes. A distance between the speech signal and the synthesis signal is calculated. Subsequently, a pitch path estimator estimates a pitch path which varies smoothly. The pitch path thus estimated is used for determining a delay code.
Funaki Keiichi
Ozawa Kazunori
Funaki Keiichi
G. Ronald Bell & Associates
Ozawa Kazunori
Renesas Electronics Corporation
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